> Right now they are just constants defined in a header, but a GUC might
> make sense. I'd like to know which version is more acceptable when I
> submit my final patch.

As much as I hate the thought of more GUCs, until we have a solid 
performance profile for synch scan we probably need them.  You should 
include the option to turn synch_scan off, such as by setting 
synch_scan_threshold to -1.

Oh, and remember that these now need to be able to take K/MB/GB.

These options should probably go in postgresql.conf under QUERY TUNING, 
with their own sub-head.


Josh Berkus
PostgreSQL @ Sun
San Francisco

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